NC State Floriculture


Low Substrate Boron Corrective Procedures

Brian E. Whipker, James L. Gibson, Paul V. Nelson, Todd J. Cavins, and John M. Dole

Disclaimer: Growers should read and follow all label directions. Test the corrective procedure on a small number of plants prior to applying it to the entire crop.

Possible Causes
Corrective Procedures
Not using a fertilizer containing boron (eg. calcium nitrate + potassium nitrate).

1. Use a fertilizer which contains B.
2. Corrective drench application of borax or solubor at 6.25 ppm of B for soilless substrates. Visible improvements with the use of the corrective B fertilization will be very slow and it is difficult to reverse growing point death or distorted leaves. For corrective application: add 0.75 oz. (21.3 g) of borax (11% B) per 100 gallons of water or 0.43 oz. (12.2 g) of solubor (20% B) per 100 gallons of water. Rinse off foliage.

Foliar sprays have a greater risk of plant injury. Avoid applications during the midday heat. Plant uptake is enhanced by prolonged drying time, which occurs during humid conditions, especially in the morning. Nutrient uptake through the leaves is also greater in the day than at night, making morning applications more desirable than evening sprays.

Little or no boron provided through the irrigation water. 1. Use a fertilizer that contains B.
Don't forget to check out the Plant Root Zone Management (PRZM) Manual for more information! Want to know more? Click here!

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